As a fan of the 7th Doctor, I bought two of my favourite episodes the other day, The Curse of Fenric and Battlefield. Both I enjoy. Curse included an interview with costume designer Ken Trew.
Perhaps some of us have already seen the DVD and taken notice. In the sketch for McCoy's costume I noticed that not only his hat band and pocket scarf are smokers hankies but so is his tie.
It clearly says, "Tobacco Hankie into Tie."
Does this mean that Sylvester's tie was made from a silk Hanky? Or was a suitable brown tie found instead? Either way it's something to wonder about. If someone knows the answer I would be interested in hearing it.